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Countries where guns are almost universally banned do not show this trend at all
That is entirely not true. In Europe, the vast majority of gun owners are centralized authority and the ruling class. (i.e. Police, Military, Politicians and their guards).
The police and military force, which are part of the government, can not be counted into the ruling class, specially not in democratic countries where every citizen can become a policeman and is in no way dictated by economic or political status.
because firearms will be needed to disarm its citizens
It would be enforced by the police force and therefore the state, which does not bring us to the direct conclusion that the elite class would be favored.
Ther may be corrupted countries where this is the case